In 1816 according to Pouqueville, Niokastro, the capital of the province of Navarino housed 600 Turkish residents (142 families), while 130 Greeks (17 families) lived in the district outside the walls.
In March 1821, with the declaration of the Revolution, the Turks of Arcadia fled to Niokastro, and were massacred by the Greek besiegers a few months later. In 1825 Ibrahim laid siege to Niokastro, which fell into his hands a few days later, while it was finally liberated in 1828 by the allied fleet, under General Maison. From the Othonian years until 1941, the castle was used as a prison, after it was no longer inhabited.
Niokastro today is remarkably preserved in its old imposing form, except for its large South tower which was cut in half when during the German occupation in 1944 the munitions stored there were blown up by Allied bombing.
